package com.gwl.server.security;

import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.gwl.server.entity.SysUser;
import com.gwl.server.service.SysUserService;
import com.gwl.server.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;
import org.springframework.stereotype.Component;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class JwtAuthenticationFilter extends BasicAuthenticationFilter {

    @Autowired
    JwtUtils jwtUtils;

    @Autowired
    UserDetailServliceImpl userDetailServlice;

    @Autowired
    SysUserService sysUserService;

    public JwtAuthenticationFilter(AuthenticationManager authenticationManager) {
        super(authenticationManager);
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        String jwt = request.getHeader(jwtUtils.getHeader());
        if(StrUtil.isBlankOrUndefined(jwt)){
            chain.doFilter(request, response);
            return;
        }

        Claims claim = jwtUtils.getClaimByToken(jwt);

        if(claim == null){
            throw new JwtException("token异常");
        }

        if(jwtUtils.isTokenExpired(claim)){
            throw new JwtException("token过期");
        }
        String username = claim.getSubject();
        // 获取用户授权
        SysUser sysUser = sysUserService.getByUserName(username);

        UsernamePasswordAuthenticationToken token
                = new UsernamePasswordAuthenticationToken(username, null, userDetailServlice.getUserAuthority(sysUser.getId()));
        SecurityContextHolder.getContext().setAuthentication(token);
        chain.doFilter(request, response);

    }
}
